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United States Patent | 5,134,594 |
Woo | July 28, 1992 |
An improved spring spider for geophones is disclosed that has the desired ratio of spurious resonant frequency to the natural frequency of the geophone and can absorb the sharp lateral forces imposed on the geophone during destructive testing and hand usage.
Inventors: | Woo; Daniel M. (Missouri City, TX) |
Assignee: | Shaw Industries, Ltd. (Rexdale, CA) |
Appl. No.: | 725198 |
Filed: | July 3, 1991 |
Current U.S. Class: | 367/187; 267/161 |
Intern'l Class: | H04R 011/00 |
Field of Search: | 367/187,182,183,185 267/161,163 |
4623991 | Nov., 1986 | Vitringa | 367/187. |
4685094 | Aug., 1987 | Vitringa et al. | 367/187. |